Integrated for Gallo 3.1

I am currently powering my Gallos with a Mcintosh 6450. My source is a macbook pro streaming apple lossless files through an airport express and into a Bryston BDA-1. I have been told the Mac is the weak link in the chain and have always considered upgrading it at some point, even though I do love the blue meters. It's only 50w into 8 ohms and I'd like a little more headroom.

Looking to invest 2-3K more, assuming a sell the Mac so maybe 4K or less used. Was thinking about a Levinson 383 or Classe CAP-2100. Any thoughts or other suggestions? thanks